Engineering posts about DNS
Curated summaries and key learnings for engineers working with DNS.
Cloudflare
11m
When DNSSEC goes wrong: how we responded to the .de TLD outage
The article discusses the DNSSEC outage affecting the .de TLD on May 5, 2026, when DENIC published incorrect DNSSEC signatures, leading to widespread SERVFAIL responses from validating resolvers. It...
Cloudflare
11m
What came first: the CNAME or the A record?
The article explores a recent incident involving DNS resolution failures caused by a change in the order of CNAME and A records in DNS responses. It details how certain DNS clients expect CNAME...